Wintertime ocean conditions over the southern Weddell Sea continental shelf, Antarctica

[1] During the austral winter of 2007 a Weddell Seal tagged with a miniaturized conductivity-temperature-depth (CTD) instrument travelled over the central southern Weddell Sea continental shelf. The instrument yielded 750 CTD profiles, 250 of them to the sea floor. The data show a full depth flow of water onto the shelf via a sill at the shelf break (74°S 44°W). The warmth from the core of the flow was able to maintain the surface mixed layer above the freezing point, resulting in a band of reduced ice-production. An estimate of the on-shelf flux suggests that this flow accounts for most of the estimated 3 Sv of water draining from the southern Weddell Sea continental shelf.

[1]  Michael A. Fedak,et al.  Attachment of a radio tag to the fur of seals , 2009 .

[2]  R. Fairbanks,et al.  Isotope data from Ice Station Weddell: Implications for deep water formation in the Weddell Sea , 1996 .

[3]  B. McConnell,et al.  Movements and foraging areas of naïve, recently weaned southern elephant seal pups , 2002 .

[4]  M. Bester,et al.  Foraging behaviour of Weddell seals, and its ecological implications , 2001, Polar Biology.

[5]  E. Nygaard,et al.  Current measurements near Ronne Ice Shelf: Implications for circulation and melting , 2001 .

[6]  O. Eisen,et al.  On the importance of leads in sea ice to the energy balance and ice formation in the Weddell Sea , 2000 .

[7]  G L Kooyman,et al.  Maximum Diving Capacities of the Weddell Seal, Leptonychotes weddeili , 1966, Science.

[8]  Gerd Rohardt,et al.  Overflow and Bottom Water Formation In The Southern Weddell Sea , 2004 .

[9]  A. Jenkins,et al.  Water mass modification over the continental shelf north of Ronne Ice Shelf, Antarctica , 2003 .

[10]  A. E. Gill.  Circulation and bottom water production in the Weddell Sea , 1973 .

[11]  M. A. Fedak,et al.  Variations in behavior and condition of a Southern Ocean top predator in relation to in situ oceanographic conditions , 2007, Proceedings of the National Academy of Sciences.

[12]  Mike Fedak,et al.  Overcoming the Constraints of Long Range Radio Telemetry from Animals: Getting More Useful Data from Smaller Packages1 , 2002, Integrative and comparative biology.

[13]  David G. Vaughan,et al.  BEDMAP: a new ice thickness and subglacial topographic model of Antarctica , 2001 .